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Tunning Technology |
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Optical Communication is made by Optical Cable
which has a very thin optical fiber. Optical Communication
has much more advantage than Coaxial Cable Telecommunication
but only one, an interconnection is very weak point
in Optical Communication. That is, the Coaxial Cable
is no problem by twist as well as mismatch but the
core of optical fiber must be connected exactly
each other by straight line on x,y,z. However it
is impossible actually that the manufacturer of
optical components produce all their products through
centered the core in the ferrule. And so TIA/EIA
recommended all manufacturers to place the core
center towards the connector key in +/-45degree.
That is, even if any enduser use any interconnect
components produced by any manufacturers, it could
be connected for fiber core to match each other
and it will be helped for minimized optical performance.
This process call “TUNING”. |
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In a tuned plug, the angular segment
into which core eccentricities are to be tuned shall
be oriented towards the connector key as illustrated
left. This is TIA/EIA standard showing Plug Tuning
Orientation and designed to serve the public interest
through eliminating misunderstandings between manufacturers
and purchasers/users, facilitating interchangeability
and improvement of products, and assisting the user
in selecting and obtaining with minimum delay the
proper product for his particular need.
As be recommended by TIA/EIA, the fiber core of
all manufacturers’ optical fiber interconnect components
shall be placed in ±45deg (or ±30deg) of Key absolutely.
This tuning results are helped for minimizing of
Insertion Loss and Return Loss as well as Polarization
Dependent Loss. |
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Some manufacturers do not TUNING in their
manufacturing process of Optical Fiber Interconnect
Components. Some manufacturers do not USE
a Standard Tuning Mastercord in there tuning
process because of expensive Tuning Mastercords
and Tuning Test Measurements and so it is
not complied with TIA/EIA Tuning. Unfortunately
some manufacturers do not know about the word
of “TUNING” yet. |
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At present, the
geometrical parameters like Radius, Apex Offset
and Fiber Height are managed in the most of
manufacturers. However most of them do not
know how much this Tuning process is important.
The standard Tuning Mastercords are supplied
by JDS Uniphase/Canada, Seiko Instruments/Japan
and TheFibers/Korea who is guaranteed by KETI
(Korea Electronics Technology Institute) and
KATS (Korean Agency for Technology and Standards).
The test measurements for Tuning are known
to DORC/USA, DATA-PIXEL/France and SNU/Korea.
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From now, you MUST check
whether you are using Tuned Interconnect
Components to improve performance of
your system/application. Also you MUST
check if your vendor/supplier know about
the word of “TUNING” and if he is tuning
by the Standard Tuning Mastercord to
be guaranteed. Because you MUST be required
more tight specification from your customers
at 2004. The Insertion Loss between
Tuned products and Un-tuned products
have much gap in this field.
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The below shows the Required
Specification Transition from Customers/Users.
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